Research On Control Strategy And Optimization Matching Of Energy And Power System For Hydrogen Fuel Cell Car

In recent years, the problem of energy and the environment has attracted close attention of all countries’ people and government departments. For the development of future automotive power source, the proton exchange membrane fuel cell has been recognized as the most development prospect of the future power supply because of its zero emissions, high efficiency and high power density. It can improve the vehicle’s power performance and the economy performance effectively through the optimization of power train system and further research on the control strategy of hydrogen fuel cell vehicle, so as to accelerate technology progress and application of the hydrogen fuel cell car.In this paper, the hydrogen fuel cell car which is modified by an internal combustion engine car is studied. The modeling and simulation research of the energy power transmission system and control strategy are studied respectively. The main results are as follows:(1) The technical scheme of the energy and power transmission system of the hydrogen fuel cell car is designed. The selected scheme is indirect parallel hybrid drive. The parameters of energy and power transmission system of the hydrogen fuel cell car is designed preliminarily according to the automobile theory knowledge, including the drive motor, the proton exchange membrane fuel cell(PEMFC), lithium-ion battery and other components’ parameters.(2) Modeling and optimizing the energy system of the hydrogen fuel cell car. Firstly, the modeling and Simulation of proton exchange membrane fuel cell and DC-DC converter are studied. The simulation results show that the DC-DC converter model can play a very good role in stabilizing and regulating voltage. Then the relative performance of the lithium-ion battery is studied, and the simulink model is built. Finally, based on the full understanding of the mixed degree of the energy system, the dual energy system of the hydrogen fuel cell car is matched based on the minimum cost of the energy system as the design goal.(3) Optimization and matching of the transmission system of the hydrogen fuel cell car. Firstly, the simulation model of the hydrogen fuel cell car is built based on MATLAB/Simulink software, including the permanent magnet brushless dc motor, the cab, the transmission, the wheels and so on. Then considering of the fuel economy and convenient operation, the fixed gear transmission is changed to two gear transmission, and the transmission ratio of the two gear gearbox are optimized. The optimization target is that energy consumption of the motor is the least in single NEDC mode and the constraint condition is to satisfy the dynamic performance of the vehicle.(4) Modeling and simulation analysis of the control strategy of the hydrogen fuel cell car energy system. Firstly, the control strategy model based on fuzzy control strategy of the hydrogen fuel cell car energy system is established. Then, the dynamic model of the hydrogen fuel cell car is simulated, and the control performance of the fuzzy control strategy is verified by the analysis of the results. And the switch model control strategy and the power following model control strategy are established according to relevant theories. It illustrates that the fuzzy control strategy of this paper is effective and reasonable through the NEDC cycle hydrogen consumption and continued driving mileage of the simulation result of the three kinds of control strategy. Finally, the CRUISE software is used to build the simulation model of the hydrogen fuel cell car, which is used to further verify the correctness of the whole vehicle model built in this article.